How to add a bank card to ur Apple id

See If your payment method is declined in the App Store or iTunes Store https://support.apple.com/en-us/HT203005

You can get Apple telephone support  for help in solving your problem using this link https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362  Be patient sometimes Apple support is closed to immediate phone support.

And here is how to contact iTunes worldwide support via text or chat using this link https://support.apple.com/choose-country-region/itunes After choosing your country, see the heading Tell us how we can help.

Change, add, or remove Apple ID payment methods - Apple Support